Heat Pump vs Gas Boiler

Making the right choice for efficiency and sustainability

Converting from Gas Boiler to Heat Pump

Key considerations for a sustainable transition

Hydronic System Compatibility

Ensure that your existing hydronic heating system is compatible with a heat pump. While most systems work, some modifications may be needed to optimize performance.

In-slab hydronic heating is generally an excellent candidate for switching to heat pumps due to lower operating temperatures.

Radiators

Radiators can be challenging for heat pumps because they typically require water at 70-80°C, whereas heat pumps work best at lower temperatures (around 40°C).

However, if your house is well-insulated or you have oversized radiators, a conversion is often possible. See Radiators and Heat Pumps for more.

Insulation & Efficiency First

Before upgrading your heat source, consider improving your home's insulation and air sealing. Reducing your heating demand maximizes the efficiency and effectiveness of a new heat pump.

Analyzing Your Gas Usage

To determine if converting is economically viable, analyze your gas consumption over the last few years. Tip: Isolate heating costs by subtracting summer usage (hot water/cooking) from winter usage.

With this data, we can:

  • Accurately calculate required heat pump sizing.
  • Estimate running costs.
  • Identify economic viability quickly.

Considerations & Trade-offs

Initial Cost

Heat pumps typically cost at least double that of a gas boiler to install.

Cold Climates

Output capacity drops as temperatures near zero, often requiring larger units.

Noise

While much quieter now, outdoor units do make noise and should be placed away from bedrooms.

Space

Outdoor units are substantial and require good ventilation/clearance.